1 /*
2 * mtdram - a test mtd device
3 * $Id: mtdram.c,v 1.37 2005/04/21 03:42:11 joern Exp $
4 * Author: Alexander Larsson <alex@cendio.se>
5 *
6 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
7 * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
8 *
9 * This code is GPL
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/ioport.h>
16 #include <linux/vmalloc.h>
17 #include <linux/init.h>
18 #include <linux/mtd/compatmac.h>
19 #include <linux/mtd/mtd.h>
20
21 static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
22 static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
23 #define MTDRAM_TOTAL_SIZE (total_size * 1024)
24 #define MTDRAM_ERASE_SIZE (erase_size * 1024)
25
26 #ifdef MODULE
27 module_param(total_size, ulong, 0);
28 MODULE_PARM_DESC(total_size, "Total device size in KiB");
29 module_param(erase_size, ulong, 0);
30 MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
31 #endif
32
33 // We could store these in the mtd structure, but we only support 1 device..
34 static struct mtd_info *mtd_info;
35
36 static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
37 {
38 if (instr->addr + instr->len > mtd->size)
39 return -EINVAL;
40
41 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
42
43 instr->state = MTD_ERASE_DONE;
44 mtd_erase_callback(instr);
45
46 return 0;
47 }
48
49 static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
50 size_t *retlen, u_char **mtdbuf)
51 {
52 if (from + len > mtd->size)
53 return -EINVAL;
54
55 *mtdbuf = mtd->priv + from;
56 *retlen = len;
57 return 0;
58 }
59
60 static void ram_unpoint(struct mtd_info *mtd, u_char * addr, loff_t from,
61 size_t len)
62 {
63 }
64
65 static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
66 size_t *retlen, u_char *buf)
67 {
68 if (from + len > mtd->size)
69 return -EINVAL;
70
71 memcpy(buf, mtd->priv + from, len);
72
73 *retlen = len;
74 return 0;
75 }
76
77 static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
78 size_t *retlen, const u_char *buf)
79 {
80 if (to + len > mtd->size)
81 return -EINVAL;
82
83 memcpy((char *)mtd->priv + to, buf, len);
84
85 *retlen = len;
86 return 0;
87 }
88
89 static void __exit cleanup_mtdram(void)
90 {
91 if (mtd_info) {
92 del_mtd_device(mtd_info);
93 vfree(mtd_info->priv);
94 kfree(mtd_info);
95 }
96 }
97
98 int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
99 unsigned long size, char *name)
100 {
101 memset(mtd, 0, sizeof(*mtd));
102
103 /* Setup the MTD structure */
104 mtd->name = name;
105 mtd->type = MTD_RAM;
106 mtd->flags = MTD_CAP_RAM;
107 mtd->size = size;
108 mtd->writesize = 1;
109 mtd->erasesize = MTDRAM_ERASE_SIZE;
110 mtd->priv = mapped_address;
111
112 mtd->owner = THIS_MODULE;
113 mtd->erase = ram_erase;
114 mtd->point = ram_point;
115 mtd->unpoint = ram_unpoint;
116 mtd->read = ram_read;
117 mtd->write = ram_write;
118
119 if (add_mtd_device(mtd)) {
120 return -EIO;
121 }
122
123 return 0;
124 }
125
126 static int __init init_mtdram(void)
127 {
128 void *addr;
129 int err;
130
131 if (!total_size)
132 return -EINVAL;
133
134 /* Allocate some memory */
135 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
136 if (!mtd_info)
137 return -ENOMEM;
138
139 addr = vmalloc(MTDRAM_TOTAL_SIZE);
140 if (!addr) {
141 kfree(mtd_info);
142 mtd_info = NULL;
143 return -ENOMEM;
144 }
145 err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
146 if (err) {
147 vfree(addr);
148 kfree(mtd_info);
149 mtd_info = NULL;
150 return err;
151 }
152 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
153 return err;
154 }
155
156 module_init(init_mtdram);
157 module_exit(cleanup_mtdram);
158
159 MODULE_LICENSE("GPL");
160 MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
161 MODULE_DESCRIPTION("Simulated MTD driver for testing");
162
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